select @@global.innodb_mtflush_threads;
@@global.innodb_mtflush_threads
8
select @@session.innodb_mtflush_threads;
ERROR HY000: Variable 'innodb_mtflush_threads' is a GLOBAL variable
show global variables like 'innodb_mtflush_threads';
Variable_name	Value
innodb_mtflush_threads	8
show session variables like 'innodb_mtflush_threads';
Variable_name	Value
innodb_mtflush_threads	8
select * from information_schema.global_variables where variable_name='innodb_mtflush_threads';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_MTFLUSH_THREADS	8
select * from information_schema.session_variables where variable_name='innodb_mtflush_threads';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_MTFLUSH_THREADS	8
set global innodb_mtflush_threads=1;
ERROR HY000: Variable 'innodb_mtflush_threads' is a read only variable
set session innodb_mtflush_threads=1;
ERROR HY000: Variable 'innodb_mtflush_threads' is a read only variable